Why would there not be a white man's country in the US? Are you presuming no successful reconquista?
The ramifications would be too far reaching to even talk about the colonization of North America. The odds of a nation resembling the US appearing are slim to none.
The biggest winners from the Normans not conquering Sicily would be the Byzantines. The Byzantine Empire retains its hold on southern Italy, and, even if they're defeated at Manzikert in 1071, Bari is still safe and secure, so the massive upheaval seen after the Double Disasters doesn't happen. The Byzantines refocus themselves as a trading nation in the central Mediterranean, meaning a weaker Venice, Genoa and Pisa, all of whom are unable to exploit a dying Byzantium to their advantage.
Meanwhile, the Normans still have to go somewhere. They might invade North Africa instead of Sicily and be defeated, but this would still weaken the Muslim emirates in the region. Though the Byzantines aren't suffering as badly as real history, they still ask for papal aid, and Urban II still siezes the excuse to seek power for himself. However, the first target of the crusaders is Muslim Sicily, a direct threat to the papacy in Rome.
The crusaders conquer Sicily, but at great cost. They do eventually reach the Levant but are defeated at Antioch and again at Acre and retreat to Cyprus, which is made into a crusader state. Sicily is re-Christianized and really not that different from real history.
From Cyprus, the crusaders essentially become pirates, weakening the Muslim states of the eastern Mediterranean and crippling trans-Mediterranean trade. The Ayyubids under Saladin decide to put an end to their privateering, but his fleet is destroyed by the crusaders while attacking Paphos. Saladin himself is killed and the Ayyubids fall apart.
I could go on, but I won't.
